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Amazon

Decay in the Amazon APIs

In Chapter 17 of Pro Web 2.0 Mashups, I created a mashup of an Amazon Wishlist and Google Spreadsheets. When I returned to examine my code last night, I learned that it no longer worked.  Why?  First, the  Amazon Ecommerce API morphed into the Amazon Product Advertising API; I was puzzled why the API wasn't listed where I expected it to be.  Unfortunately, Amazon, in its infinite and inscrutable wisdom,  also decided to kill the ListLookup operation, the one call that I depended on to retrieve the content of my Amazon wishlist.  (I'm not alone in having broken applications because of this change.)

So what to do now?  Interestingly enough, someone just announced a JSON feed service for a given wishlist, for example, Jeff Bezos' wishlist and mine (in JSON).  I hope it stays around.  How does it work given the demise of the ListLookup operation?  My guess is that some sort of screen-scraping is going on.

2011 02 23

Amazon
Amazon EC2
Chapter 17
screen scraping

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Services built upon Amazon EC2

According to How To: Getting Started with Amazon EC2 - PaulStamatiou.com, the following services are built on top of EC2 (and thereby perhaps make scaling up EC2 easier):

What other ones are out there?

2008 12 18

Amazon
Amazon EC2

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Amazon startup challenge

It's tempting to enter an idea into the Amazon.com: Startup Challenge. Alas I don't have enough time to flesh the idea sufficiently to become a serious contender.  I've long wanted to pull together some deep personal computational infrastructure by combining S3 and EC2 and SQS -- but writing up those ideas will have to wait.

2007 10 28

Amazon
Amazon S3

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Firefox plugins for Amazon EC2 and S3; developer forums for Amazon

In my post Mashup Guide :: Amazon URL structures, I mentioned that I will pose my questions concerning the Amazon web services in the appropriate forums. I'm looking at the list of forums Amazon Web Services Developer Connection : Developer Connection but I'm uncertain whether any of them is appropriate yet. Along the way I did find the Amazon EC2 Firefox Extension. I plan to come back to looking at that plugin, in combination with S3 Firefox Organizer(S3Fox), as ways to jumpstart one's exploration of Amazon S3 and EC2.

2007 04 19

Amazon
Chapter 16
Firefox
web browser

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Amazon URL structures

I spend a substantial part of Chapter 2 on the topic of understanding the syntax and semantics of URLs in web applications. Knowing how URLs are formed lays the foundation of mashing them up later but also enables users to recombine content from various sites without much programming.

In the chapter, I look at URLs in Flickr. Google Maps, del.icio.us, and amazon.com. Below is an excerpt of the chapter about amazon.com. One major question I have is whether someone has documented the URL structures for amazon.com in a more comprehensive fashion, akin to what Google Map Parameters - Google Mapki does for Google Maps. I will post that question on the appropriate forums when I figure what they are. Anyone out there know the answer?

Amazon walkthrough

Amazon.com is another interesting site to look at. Not only is it a popular e-commerce site, it is a pioneering e-commerce platform which is easily remixed and recombined with other content. Although we will study the Amazon APIs later, we focus here on how amazon.com from the view of an end-user. Moreover, the goal in this section is not learn all the features of amazon.com but rather to study the structure of URLs used in amazon.com -- specifically the question of how to link to the site. (While Amazon sells a lot of merchandise other than books, we will look at books to focus our walk-through. Moreover, we focus here on amazon.com, the site geared to the USA instead of the network of sites aimed to customers outside the USA.)

The strategy we follow here is to discern the key entities of the amazon.com site through a combination of using and experimenting with the site, sifting through documentation, seeing what other users have done. Note that since some of the conclusions are not supported by official documentation from amazon.com, there is no long term guarantee behind the URLs.

Amazon items

It doesn't take much use of amazon.com to see that the central entity of the site is an item for sale (akin to a photo in Flickr). By looking at the URL of a given item and looking throughout a page describing it, you will see that Amazon uses ASIN (Amazon Standard Identification Number) as a unique identifier for its products.[1] For books that have an ISBN, the ASIN is the same as the ISBN for the book. According to the Wikipedia article, on amazon.com, you can point to a product with an ASIN with the following URL:

http://www.amazon.com/gp/product/[ASIN]

Take for instance, Czeslaw Milosz’s New and Collected Poems (paperback edition), which has an ISBN of 0060514485. You can find it on amazon.com at

http://www.amazon.com/gp/product/0060514485

It is important to know that the way to link to amazon.com has changed in the past and will likely continue to change. For instance, you can also linkt to the book with

http://www.amazon.com/exec/obidos/ASIN/0060514485

or even a shorter form.

http://amazon.com/o/ASIN/0060514485

The use of this syntax would ideally be founded on some official documentation from amazon.com. Where would one find definitive documentation on how to structure a link to a product of a given ASIN? A search through the amazon developers' site leads to the the technical documentation[2], whose latest version at the time of writing is the 2007-04-04 edition of the technical docs[3] That trial leads ultimately to a page on the use of identifiers , which, alas, does not spell out how to formuate the URL for an item with a given ASIN.[4] The bottom line for now: the Wikipedia plus experimentation is the best way to discern the URL structures of amazon.com.

Let's apply this approach to other functions of amazon.com. For instance, can we generate a URL for a full-text search? Go to amazon.com and drop in your favorite search term. Take for example, flower. When you hit submit, you'll get a URL that looks like:

http://amazon.com/s/ref=nb_ss_gw/102-1755462-2944952?url=search-alias%3Daps&field-keywords=flower&Go.x=0&Go.y=0

If you do the search again, say in a different browser, you will get another URL. I got:

http://amazon.com/s/ref=nb_ss_gw/102-8204915-1347316?url=search-alias%3Daps&field-keywords=flower&Go.x=0&Go.y=0&Go=Go

Notice where things are similar and where the URLs are different from one another. Looking for what's common (the http://amazon.com/s prefix and ?url=search-alias%3Daps&field-keywords=flower&Go.x=0&Go.y=0&Go=Go argument), you might try to eliminate the sections which are different:

http://amazon.com/s/?url=search-alias%3Daps&field-keywords=flower&Go.x=0&Go.y=0&Go=Go

which seems to work fine. You can even eliminate &Go.x=0&Go.y=0&Go=Go to boil the request down to

http://amazon.com/s/?url=search-alias%3Daps&field-keywords=flower

How to limit it to books? If you go to amazon.com and select the book section and use a flower keyword, you will get a URL similar to

http://amazon.com/s/ref=nb_ss_gw/102-6984159-2338509?url=search-alias%3Dstripbooks&field-keywords=flower&Go.x=12&Go.y=6

Stripping away the parameters that we had done before give you:

http://amazon.com/s/?url=search-alias%3Dstripbooks&field-keywords=flower

This trick works for the other departments. For example, to do a search on flowers in Home & Garden:

http://amazon.com/s/?url=search-alias%3Dgarden&field-keywords=flower

Let's run through the syntax of other organizational structures:

Lists

To go to the wishlist section:

http://www.amazon.com/gp/registry/wishlist/

If you are logged in, you will see a list of your lists on the left. Look at the URL of one of them, which will look like

http://www.amazon.com/gp/registry/wishlist/1U5EXVPVS3WP5/ref=cm_wl_rlist_go/102-5889202-4328156

You'll see that the since the right hand number (e.g., 102-5889202-4328156) remains the same but one number (e.g., 1U5EXVPVS3WP5) changes for each list that 1U5EXVPVS3WP5 is the identifier for the list. You can point to a list by its list identifier by

http://www.amazon.com/gp/registry/wishlist/1U5EXVPVS3WP5

Tags

Tags are a recent introduction to Amazon.com. You will see links like

http://www.amazon.com/tag/czeslaw%20milosz/ref=tag_dp_ct/102-8204915-1347316

which can be reduced to

http://www.amazon.com/tag/czeslaw%20milosz/

Subject headings

In looking through the Browse-subject section of amazon.com (http://www.amazon.com/Subjects-Books/b/?ie=UTF8&node=1000), you can find a link such as

http://www.amazon.com/b/ref=amb_link_1760642_21/104-0367717-9318361?ie=UTF8&node=5&pf_rd_m=ATVPDKIKX0DER&pf_rd_s=center-3&pf_rd_r=0J0MADE0YSN1VRBA6XZS&pf_rd_t=101&pf_rd_p=233185601&pf_rd_i=1000

(which refers to the Computers & Internet Section) to

http://www.amazon.com/b/?ie=UTF8&node=5

(The fact that the node is specified by number rather than any word-based descriptor makes one concerned about the long term stability of the link. Will 5 always refer to computers or if there is another section added that goes before it alphabetically, will the link break?)

There are plenty of other entities whose URL structures can be discerned, including Listmania lists (e.g., http://www.amazon.com/favorite-literary-poles/lm/1FH0E3G892IA/ and http://www.amazon.com/lm/1FH0E3G892IA/), So You'd Like to Guides (e.g., http://www.amazon.com/gp/richpub/syltguides/fullview/3T3I3YDBG889B), personal profiles (e.g., http://www.amazon.com/gp/pdp/profile/A2D978B87TKMS2/)


 

[1] http://en.wikipedia.org/wiki/Amazon_Standard_Identification_Number

 

[2] http://developer.amazonwebservices.com/connect/kbcategory.jspa?categoryID=19

[3] http://developer.amazonwebservices.com/connect/entry.jspa?externalID=703&categoryID=19

 

[4] http://docs.amazonwebservices.com/AWSECommerceService/2007-04-04/DG/ItemIdentifiers.html

2007 04 19

Amazon
Chapter 02

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Chapter 2: First draft

I have posted the first draft of Chapter 2 (pdf) "Looking at Flickr, Del.icio.us, Google maps, and Amazon.com as end-user tools". The chapter analyzes Flickr (as our primary extended example) for what makes it the remix platform par excellence for learning how to remix a specific application and exploit its many features that make it so remixable. The chapter compares and contrasts flickr with other remixable platforms: del.icio.us, Google Maps, and amazon.com.

2007 04 19

Amazon
Chapter 02
del.icio.us
drafts
Google Maps

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